/*
 * Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.querydsl.jpa;

import com.mysema.commons.lang.CloseableIterator;
import com.querydsl.core.DefaultQueryMetadata;
import com.querydsl.core.NonUniqueResultException;
import com.querydsl.core.QueryMetadata;
import com.querydsl.core.QueryResults;
import com.querydsl.core.Tuple;
import com.querydsl.core.types.Expression;

class JPASubQuery<T> extends JPAQueryBase<T, JPASubQuery<T>> implements JPQLSubQuery<T> {

  JPASubQuery() {
    super(new DefaultQueryMetadata(), JPQLTemplates.DEFAULT);
  }

  JPASubQuery(QueryMetadata metadata) {
    super(metadata, JPQLTemplates.DEFAULT);
  }

  @Override
  protected JPQLSerializer createSerializer() {
    return new JPQLSerializer(getTemplates(), null);
  }

  @Override
  protected void reset() {
    // do nothing
  }

  @Override
  public JPASubQuery<T> clone() {
    return new JPASubQuery<T>(getMetadata().clone());
  }

  @Override
  public <U> JPASubQuery<U> select(Expression<U> expr) {
    queryMixin.setProjection(expr);
    @SuppressWarnings("unchecked") // This is the new type
    JPASubQuery<U> newType = (JPASubQuery<U>) this;
    return newType;
  }

  @Override
  public JPASubQuery<Tuple> select(Expression<?>... exprs) {
    queryMixin.setProjection(exprs);
    @SuppressWarnings("unchecked") // This is the new type
    JPASubQuery<Tuple> newType = (JPASubQuery<Tuple>) this;
    return newType;
  }

  @Override
  public T fetchOne() throws NonUniqueResultException {
    throw new UnsupportedOperationException();
  }

  @Override
  public CloseableIterator<T> iterate() {
    throw new UnsupportedOperationException();
  }

  @Override
  public QueryResults<T> fetchResults() {
    throw new UnsupportedOperationException();
  }

  @Override
  public long fetchCount() {
    throw new UnsupportedOperationException();
  }
}
